“U.S. No. 1” consists of grapefruit which meet the following requirements:

(a) Basic requirement:

(1) Discoloration:

(i) Not more than one-half of the surface, in the aggregate, may be affected by discoloration. (See §51.638.)

(2) Firm;

(3) Mature;

(4) Similar varietal characteristics;

(5) Fairly well colored;

(6) Fairly smooth texture; and,

(7) Fairly well formed.

(b) Free from:

(1) Bruises;

(2) Cuts not healed;

(3) Caked melanose;

(4) Growth cracks;

(5) Sprayburn;

(6) Decay; and,

(7) Wormy fruit.

(c) Not damaged by any other cause.

(d) For tolerances see §51.628.